KEY TO PENCILLIA 207 
KEY TO PENICILLIUM MOLDS 
(After Thom, 1910) 
A. Species fruiting typically by coremia (vertical and definite). 
a. Coremia long (8-15 mm.). 
1. Conidial masses strictly terminal, olive green, 
fragrant... 0... cece cece eee eee eee P. claviforme 
2. Upper third of coremia fertile, conidia green..P. duclauxii 
aa. Coremia small. 
1. Coremia definite, densely crowded, colony 
orange below........... 00 cc eect eee ee ees P. granulatum 
2. Coremiform characters indicated incultures by 
clustering of conidiophores, definite coremia 
only in old cultures becoming large and def- 
Inite on apples. ... 6... eee ee eee P. expansum 
AA. Species not (or rarely) producing coremia in culture. 
B. Species constantly producing sclerotia or ascigerous 
masses. 
b. Producing asciginous masses, yellow or red- 
dish... .. cece ccc eee eee ees P. luteum 
bb. Sclerotia appearing as white masses in old 
cultures... .. Lene e eee ene eee eens P. italicum 
bbb. Sclerotia reddish or pink, globose or ellip- 
tical, 500 microns or less in diameter. 
c. Conidial fructification in column. 
1. Column dense long, sclerotia partiall, 
buried in substrate............. P. No. 30 
2. Column formed of loose chains, scle- 
rotia numerous, exposed........ P. No. 29 
cc. Conidial fructification of divergent chains: 
1. Rapid liquefier, spores globose. 2-5 
MICYONS. 2... eee ee ees P. No. 31 
2. Slow liquefier, spores elliptical, 3.5-4 
by 2.5-3 microns. ............. P. No. 82 
BB. Sclerotia not(or rarely) produced under special conditions. 
C. Rapid liquefiers (abundant liquid in 5 to 12 days). 
D. With definite strong ammoniacal odor: 
1. Yellowish brown-avellaneous spores rough... P. brevicaule 
2. White or cream spores rough.............. P. brevicaule 
3. White or cream, spores smooth............ P. brevicaule, ver. 
glabrum 
